SPRUIU1D July 2020 – December 2024 DRA821U , DRA821U-Q1
As described in Section 12.4.2.4.2, the Time Base (TB) module can be configured to operate in 3 distinct count modes:
The timing diagrams in Figure 12-2618 to Figure 12-2621 show how CMPA and CMPB events are generated in each of the 3 count modes and how the EPWMxSYNCI signal interacts.

Figure 12-2619 EPWM Counter-Compare Events in Down-Count Mode
Figure 12-2620 EPWM Counter-Compare Events in Up-Down-Count Mode, EPWM_TBCTL[13] PHSDIR = 0 Count Down on Synchronization Event
Figure 12-2621 EPWM Counter-Compare Events in Up-Down-Count Mode, EPWM_TBCTL[13] PHSDIR = 1 Count Up on Synchronization Event